The aim of this study is to examine how a structured intensive training period with a phonological multisensory reading training method, at the end of Grade 1, can develop pupils' ability to connect phonemes with the corresponding graphemes as well as their ability to decode. A total of 38 pupils in Grade 1 from four elementary schools participated in this randomized controlled trial (RCT) study. Of the 38 pupils 19 were randomly assigned to be part of the intervention group, the other 19 were included in the control group. The intervention involved 30 minutes of intensive training on a total of 20 sessions. The control group participated in regular reading lessons in the classroom. The study included pre- and posttesting of phonological awareness, letter knowledge, and decoding. The result shows that intensive phonological awareness training with articulation, during 20 sessions spread over 4-5 weeks, stimulates pupils' decoding ability in a positive direction.